In almost all cases we recommend that you define your virtual switch
using "CONTROLLER *" (the default) and simply use
the two pre-configured VSWITCH controllers
provided. Note 1
A controller does the work to initialize and terminate a VSWITCH
OSA-E
connection and is not involved in the data transfer work, which
is handled by the Control Program (CP).
You may want to have extra controllers
if you are in a test environment, or are using
TRACE OSD or MORETRACE OSD to debug a problem.
For example, you may want to isolate
messages for a specific virtual switch
Virtual switch timeout (stall) checking
should be disabled.
when using the OSD trace. That is done by specifying
the FAILOVER_DISABLED option
on the VSWITCH CONTROLLER statement in the controller's
TCP/IP configuration file.
All other failover processing remains unchanged.
Note 1
Pre-configured controllers
DTCVSW1 and DTCVSW2 are provided starting
with z/VM Release 5, Version 2.0.
Please direct questions, comments and feedback to:
Mary Ellen Carollo
z/VM Development
maryelln@us.ibm.com
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